Door lock and latch



May 30, 1939. E. J. BAUME 2,160,301

DOOR LOCK AND LATCH Filed Sept. 25, I936 I [q 0 I/VVzf/VTOR.

mum 5.0mm .L5/7U/VE. 1 BX Patented May 30, 1939 UNITED STATES PATENT"OFFICE DOOR LOCK AND LATCH Edwall J. Baum, Long Beach, Calif.Application September 25, 1936, Serial No. 102,565

' 6 Claims. (01. 292-16 7) This invention relates to a novel door lockand latch, the prime object of which is to provide a novel means ofretracting the bolt by a v minimum amount of rotation of the knob.

Another object is to provide a door lock and latch, including a novelflexible link connecting the lock bolt finger and the knob spindle, saidlink acting as a camming means as well as a y, link for the purpose ofretracting the bolt.

m Still another object is to provide a novel means attachable to theknob spindle which means is pivotally connected to the flexible linkwhereby the flexible link is actuated to retract the bolt.

J A feature of my invention is to. provide a door lock and latch whichis simple in construction, easily installed, and effectivein operation.

Other objects, advantages and features of invention may appear from theaccompanying in drawing, the subjoined detailed description, and

the appended claims.

In the drawing: Figure 1 is a side elevation partly in section of mylatch and lock in position in a door.

Figure 2 isa top plan View of the same, a fragment of the spindle beingshown.

Figure 3 is a side elevation of the lock and latch with parts brokenaway to show interior construction. l

Figure 4 is a side elevation showing the parts in partial and fullretracted position.

Figure 5 is a side elevation of a modified form of latch.

Figure 6 is a side elevation with parts broken 6 away to show interiorconstruction of still another modified form of latch.

Referring more particularly to the drawing, the numeral I indicates adoor or the like, in which my lock'and latch are mounted. Two

horizontal bores 2, 3 are provided in the door,

these bores intersecting at right angles, the one bore 2 receiving'thebolt assembly and the bore 3 receiving the spindle, as will besubsequently described.

45 My latch consists of a housing 4, preferably tubular in crosssection, which housing extends inwardly from the face plate 5. The faceplate is attached to the edge of the door, as shown in Fig. 1, all ofwhich is usual and well known.

50 A rear plate 6 closes the inner end of the housing 4, and this plateis suitably attached to the housing, or, if desired, may be integrallyformed therewith.

As shown in Figs. 1 to 3, inclusive, the bolt 55 'I is slidably mountedin the housing 4 and protrudes thru the face plate 5. A pair of guidearms 8, 8 extends inwardly from the bolt 1 and thru the ,rear wall 6.Each of these arms is provided with a longitudinally extending slot 9,the purpose of which will be further de- 5 scribed.

A coil spring I0 bearsagainst the bolt I and against the'rear plate 6,thereby yieldably pressing the bolt outwardly. A look bolt finger IIextends thru the rearwall 6 and is slidable 10 therein. The crosshead I2or T-head of the lock bolt finger extends into the slots 9 and isslidable in said slots. 'The cross head engages the arms 8 at the outerends of the slots 9, and thus serves to actuate or retract the bolt 1.Due to the slots 9, the bolt can retract independently of'the finger II. I

A coil spring 13 serves to yieldably press the finger II inwardly, andalso acts to hold .the door knob in proper position, all of which isusual in locks of this character. A lever plate I4 is removably secluredto the knob spindle I5. and the lever plate is preferably provided witha square hole thru which the spindle extends. Thus, it will be evidentthat the lever plate will rotate with the spindleas the knob is turnedby the user.

A link I6 is pivotallyattache'd to the lever plate I4 and encircles thecross .head of the lock bolt finger II. That'is, this link is preferablyin the formof .a strap, altho other analogous forms can be used. Whenthe door knob is first'rotated, the link I6 will be tilted, as

shown in solid lines in Fig. 4. This v tilting of' the link causes acamming action to occur between the cross head I 2 of the lock boltfinger and the rear wall '6 of the housing. This serves to retract thelock bolt finger and the bolt. On further rotation of, the knob, theparts assume the posiiton as shown indotted linesin 40 Fig. 4, whereuponthebolt I is retracted to its fullest extent.- This combination'ofa'camihing action and a direct pull on the lock bolt finger enables thebolt to be retracted with a minimum rotation of the knob, in eitherdirection. 4

For locking purposes, the lever plate I4 is provided with a plurality ofarcuate recesses I1,

one of which is engaged by a locking tumbler I8 mounted in the door. Onrotation of the tumbler, a solid portion thereof rotates into therecesses II, thus holding the lever plate against rotation and therebylocking the door.

In Fig. 5, I have shown a. modified form of lever which is pivotallyattached to the link I9. This consists of a threaded bolt 20 whichscrews into the spindle 2|. The action and operation of the latch is thesame as previously described. The threaded bolt 20, however, enables thelatch to be adjusted in the door so that less care is finger, saidfingerprotruding .Ithro'ugh the wall,

necessary in drilling the bore 3 with relation to the outer edge of thedoor.

In Fig. 6, the arms 8 on the bolt are eliminated, and in thisconstruction the bolt 22 is formed with inwardly extending lugs 23 whichare engaged by the head 24 of the lock bolt finger 25. A link 26 isemployed, the same as. previously described. A spacewithin thebolt 22enables the bolt to move relative to the head 24 of the bolt finger.

Springs 21, 28 yieldably press the bolt and the bolt finger inwardly,the same asv previously described.

It will be noted from examination of Fig. 4 that the link I6 has a widebearing face .which acts against the head I2. important feature of thewide bearing face against the head I2 is that it enables the bolt to bewithdrawn with a minimum amount of rotation of the{knob Since the *pull'of the link ifiy'is exerted at the outer edges, as is evidencedfi'n Fig.4, a slightrotation ofthe knob will causea considerable retraction of ving through saidwall; said bolt'finger includinga-cross-head-on-theinner end "thereof, means" attaching the boltfinger'tothebolt; a' knob spindle, a lever plate non rotatably mountedon the spindle; a link pivotally secured at one end to the leverp1ate','the other endof said link loosely engaging the outer ends of thecross-head whereby tilting of said link on rotation ofthe lever platewill cam the bolt finger inwardly to retract the bolt.

: 2. A door latch comprising a housing adapted to be mounted in a door,a'bolt slidablyniounted in the housing. a bolt finger, meansslidablycoupling .the, bolt finger and the bolt, spring means engaging the'bolt"and urgingsaid bolt outwardly,

an in ner wall on the housing, a 'lsecond spring bearing against thewall .and against the belt a knob spindle, a lever non-rotatablymountedon thespindle, a link pivotally attached at oneend tosaid lever, across-head on the bolt finger, said link loosely engaging thecross-headwhereby said finger is retracted by'the link onrotation of thespindle, said linkf engaging.said.wall and the cross-head tocam'thefinger inwardly as said lin'ktis tilted.

3. door latchcomprising a housing adapted to be mounted in a. door, abolt slidably mounted in the housing, a wall closing the inner end ofthe housing, a bolt finger extending through said wall, means slidablyattaching the bolt finger to the bolt, a T-shaped head on the inner endof the bolt finger, a knob spindle, a lever mounted on the spindle, alink pivotally attached at one end to the lever, the other end of saidlink loosely engaging the T-shaped head of the bolt finger, said linkbearing against said wall, whereby tilting of said link ineitherdirection will urge the bolt finger inwardly, and'a' direct pullof said lever further retracting the bolt finger to completely retractthe bolt.

4. A door latch comprising a housing adapted tobe mounted in a door, abolt slidably mounted in thehousing-,-''a bolt finger, means connectingthe bolt and bolt finger, a spring in the housing bearing agairist-the--bolt and urging said bolt outwardly, an inner wall in the housing, saidfinger protruding through the wall, a knob spindlega lever non rotatablymounted onthe spindle, a link pivotally attached at one end tosaid-lever, a cross head' on the'ir'm'er end of the bolt finger,said-link'loosely engaging the cross: head adjacent the outer ends ofsaidhead,"whe'reby said finger is retracted 1 y the link'on rotation ofthekno'b'spindle.

5'.'A door latizhfincluding a knob spindle, a housing adapted tober'nou'nted ina doorfa bolt slidably mounted in the housing, alever-mounted on "the' spindle, aboltfinger, 'means attaching the fingerto the-"bolt," a 'lf shape'd head" on the inner end of thefinger, alinkpivotally attached at one end to the lever, the other end of saidlink loosely engaging both or the outer ends"of the T-shaped head onthe-finger; whereby" a'" wide bea'ring is provided between-the 'headandthe link, said linkretracti'ng the "bolt-finger on" rotation of thespindle, said link tilting on rotation of the-spindle;- whereby the boltfinger is moved inwardly a greater distance"'tharrtheinward. directionalmovement in a parallel plane of the pivot, whichconnects tli'e linka'ndthele'vei'? 6. A door l'atch"including'"'-a knob'spindle, a housing"adapted to be mounted in ames bolt slidably mounted in the hou's'in'gfaspring in the housing engaging the bolt to" project this bolt outwardly;a lever plate mounted o'ri' the spindle; a finger attached to the bolt,a cross-head on the finger extendingputwardly from the centerlongitudinal axis of the'fi'ngrfia link'loosely en"- gaging both ofthe'oute'r'nds of thec'i'os's head; a pivot pin connecting the inner endof thelink to"the:1ever"plate, saidj'link' being tilted'by the rotationof thelever plate, "the link bearing against the outer ends'oftlie'cross-head on rota tion of'the lever platejthereby retracting thebolt a greater 'distancea'long' itslongltudinal axis than the travel ofthe pivot pinofthe lever plate in a parallel plane when the knob 'spindle is rotated;

